clear all 
clc
x1=[11.8 10.5 10.6 9.6 10.7 9.8 10.9 11.1 10.6 10.3];
x2=[10.2 10.6 9.8 12.2 10.6 9.8 10.6 10.1 9.5 9.9];
x=[x1 x2]';
m=10;sigma=0.4;a=0.05;
[h,sig,muci]=ztest(x,m,sigma,a,1)
